Its important that your pool water remains at a healthy pH level. If your pool water is either too alkaline or too acidic, it can cause real problems for your pool and can even cause skin irritation for those bathing in the water. Our pH Reducing Granules is made using sodium bisulphate to lower pH levels easily and quickly, making the pH levels just right. By maintaining your pool waters pH levels, youre making sure that the water is a safe place to relax and bathe in. Pro-Kleens pH Reducing Granules reduce the pH levels with ease, making sure your water is a safe and hygienic place to bathe. Our granules help to prevent skin irritation, limescale & cloudy water so that your hot tub, pool or spa stays looking and working its best! These pH Reducing Granules are perfectly safe to use in all hot tubs, spas and pools.